After going through the first 3 steps indicated in this article in order to add your new subdomain, below are the following steps you need to take in the domain registrar before going back to finish the process and having your new subdomain in Instapage.
Click the domain you'd like to use with your page;
Since DNS Park is your hosting service, and not your domain registrar, be sure that your domain points to DNS Park's name servers. This will allow your MX record configuration to take effect;
Click Alias Records;
Under Host Name, enter only the subdomain you want to use. For example, if you picked lander.mydomain.comas your address, enter lander here. Or, if you're using a root domain such as www.mydomain.com then you'll want to enter wwwhere;
Under Destination Name, enter secure.pageserve.co;
Click Add Alias.
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